Rock-drill



(No Model.)

D. HILT. ROGK DRILL.

No. 464,612. Patented Dec. 8, 1891.

Inveniar:

UNIT D STATES PATENT OFFICE.

DANIEL HILT, OF HELAM, PENNSYLVANIA.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 464,612, dated December8, 1891.

Application filed December 10, 1890. Serial No. 374,157- (No model.)

T0 at whom it ntcty concern:

Be it known that I, DANIEL I-ITLT, a citizen of the United States,residing at Helam, in the county of York and State of Pennsylvania, haveinvented certain Improvements in Rock- Drills, of which the following isa specification.

This invention relates to improvements in that class of rock-drillsknown'as churndrills,? in which the drill is partially rotated with eachstroke as it is driven against or into the rock; and it consists in theconstruction and combination of parts hereinafter described, andspecifically pointed out in the claims.

In the accompanying drawings, which form a part of this specification,Figure 1 is a side elevation of my invention. Fig. 2 is a top or planview of the same, the cross-bar A of the frame, the guide-tube f, withits supporting- -arm, and the screw-guideE E being removed.

Fig. 3 is an end elevation of that end of the frame in which thetappet-wheel is j ournaled. Fig. 4 is an enlarged side elevation of theratchet-wheel and a portion of the drill; and Fig. 5, a plan View of thesame, the drill being shown in section.

Similar letters indicate like parts throughout the several views.

Referring to the details of the drawings, A indicates the posts of theframe; A, the horizontal side bars, and A and A the horizontal end bars.

a is a top cross-piece gained into the top of the side bars A near thefront posts, and a a similar cross-piece gained into the under side ofthe same side bars near and in front of the tappet-wheel B.

M represents uprights gained into the outside faces of the side bars Abetween the cross-pieces a a, and R a longitudinal plate supported bybars 1 and 2, connected with the posts A.

m is a rock-shaft journaled in the uprights M, the upper side beingflattened at the center, as shown at m, Fig. 2, to afford a good bearingfor the lever D, which rests upon it. Extending upward from the centerof the bearing m there is a pin p, which passes through a perforation inthe lever and serves to hold it in place on the rock-shaft.

d, which embrace the periphery of the tappetwheel 13. The other end ofthe lever extends forward somewhat beyond the front posts A and passesbeneath the inner end of a screwguideEE,through which theshankofthedrill passes. A link d is pivotally connected with the front end ofthe lever and passes upwardthrough jaws 6, formed by the inner ends ofthe sections E E of the screw-guide, where it is pivoted to a bolt 6,passing through it and the said jaws, as shown in Figs. 1 and 2.

E- E are two sections of the screw -guide, which are halved together attheir outer ends and pivotally connected by a bolt e In the inner faceof the body of each of these sections there is formed a semicircularrecess, which, when the sections are closed together, register with eachother and form a circular opening. Both recesses have threads cuttherein, so that when the sections are closed together, as stated, theyform a'female screw.

F represents a drill, the shank of which has screw-threads cut thereinadapted to engage the female screw in the screw-guide E E, and

on opposite sides of said shank there is formed a groove f, extendinglongitudinally of the shank, as shown in Figs. 1 and 4.. The upper endof the shank passes through a cylindrical guide f, supported by an armprojecting from the front of the frame.

G is a ratchet-wheel pivoted on the forward end of the plate It andhaving a hub H formed on the upper surface thereof. The ratchetwheel isheld down on the plate bya metallic strap 9. Both the ratchet-wheel andhub have a vertical opening through the center, through which the lowerend of the shank of the drill passes. In opposite sides of the openingthrough the hub are fixed vertical ribs h,which register with and engagethe grooves f in the opposite sides of the shank of the drill.

Below the main shaft there is a crank-shaft O, journaled in the posts A,and on the right side of the frame, inside of the post A, there diatelybeneath it there'is a similar pulley T, keyed to the crank-shaft, andaround these pulleys there passes an endless belt S.

0' represents a driving-rod, having its rear end engaging the crank c ofthe crank-shaft C. On its front end is formed a prong bent inward andadapted to engage the teeth of the ratchet-wheel G.

N is a spiral spring connecting the crosspiece a and the lever, beingattached to the latter between the rock shaft and screwguide E E.

Depending from the cross-piece a there is a post a having a transversebar a secured to its lowerend, adapted to limit the upward movement ofthe rear end of the lever D. If preferable, the upper horizontal bars Amay be lowered, as shown by the dotted lines a, Fig. 1, so that thecross-piece a itself may prevent a too-extended upward movement of theinner end of the lever. To the one end of the shaft 1) there is acrank-handle t attached, by which motion is imparted thereto.

In operating the tappet-wheel is revolved by turning the crank-handle t.The tappets b successively depress the inner end of the lever D as theyare brought into contact with it,ihc coiled spring N in each instancereturning theleverto its normal position. This movement of the levercommunicates a reciprocating motion to the screw-guide E E, which raisesand lowers the drill by reason of their screw connection. At the sametime motion is imparted to the crank shaft C through the medium of thepulleys T T and the endless belt S. This produces a reciprocatingmovement of the driving-rod c, which causes the prong on the forward endthereof to successively engage the teeth of the ratchet.- wheel G andimpart an intermittent rotary motion thereto. Each of the intermittentmovements of the ratchet-Wheel G partially turns the drill about itsaxis between the delivery of its blows, and by reason of the manner ofits connection therewith lowers it in the screwguide E E. To raise thedrill in the screw guide E E, the jaws 6 thereof are opened by removingthe nut shown in Fig. 2 from the end of the bolt 6. By the movementsjust described the drill is raised and lowered so as to make it strikewith force, and at the same time itis turned about its axis to enableeach succeeding blow to be delivered on a different spot.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a drilling device, the combination,with a guide provided with ascrew-threaded opening, a drill having a screw-threaded shank adapted toengage the threaded opening through the guide and provided withlongitudinal grooves, a' ratchet-wheel having an opening through whichthe drill passes, and ribs located in the opening through theratchet-wheel, constructed to engage the longitudinal grooves in thedrill, of a tappet-wheel mounted on a shaft 1), a rock-shaft locatedbetween said guide and the tappet-wheel, a lever having its fulcrum inthe rock-shaft, the said lever having a link connection with said guideand being adapted to be actuated by the tappet-wheel, a crank-shaftjournaled below the shaft 1), a gearing connecting the shaft b and thecrank-shaft, and a driving-rod having one end connected with the crankof the crankshaft an d the other constructed to engage the teeth of theratchet-wheel, substantially as and for the purpose specified.

2. In a drilling device, the combination, with a guide provided with ascrew-threaded opening, a drill having a screw-threaded shank adapted toengage the threaded opening through the guide and provided withlongitudinal grooves, a ratchet-wheel having an opening through whichthe drill passes, and ribs located in the opening through theratchet-wheel, constructed to engage the longitudinal grooves in thedrill, of a tappet-wheel mounted on a shaft 1), a rock-shaft locatedbetween said guide and the tappet-wheel, a lever having its fulcrum inthe rock-shaft, the said lever having a link connection with said guideand being adapted to be actuated by thetappet-wheel, a spring locatedbetween the said guide and the rock-shaft and constructed to depress theforward end of said lever, a stop to limit the upward movement of therear end of said lever, a crank-shaft journaled below the shaft Z), agearing connecting the shaft 1) and the crank-shaft, and a driving-rodhaving oneend connected with the crank of the crank-shaft and the otherconstructed to engage the teeth of the ratchet-wheel, all 0011- structedand operating substantially as and for the purpose specified.

DANIEL IIIL'I. \Vitnesses:

WALTER B. WHITE, WILLIAM BEITZEL.

